GUIDELINE ON ENVIRONMENTALLY SOUND TESTING, REFURBISHMENT & REPAIR OF USED COMPUTING EQUIPMENT - The purpose of this guideline on the environmentally sound testing, refurbishment and repair of used computing equipment is to promote greater reuse of such computing equipment, through environmentally sound refurbishment and repair and the environmentally sound management of any discarded equipment or components. Extending the life of computing equipment generally results in the best environmental outcome, reducing the demand for natural resources and increasing waste prevention. Refurbishing and repairing used computing equipment using environmentally sound management requires a broad set of skills and operational controls to enable the process to be efficient and to minimize impacts on human health and the environment. Given the complexity of the computing equipment market, it is the intention of this work to provide general guidelines that will be useful for years to come and to offer guidance for refurbishment facilities around the globe. It offers guidance in four parts.